1/3x²-3x ≤ 0|·3
x²-9x ≤ 0
x(x-9) ≤ 0
x=0 ∨ x-9=0
x=0 ∨ x=9
x∈<0,9>
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1/3x²-3x ≤ 0|·3
x²-9x ≤ 0
x(x-9) ≤ 0
x=0 ∨ x-9=0
x=0 ∨ x=9
x∈<0,9>